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Polysaccharide-base gel composite film, and preparation method and application thereof

A composite film and gel technology, used in transportation and packaging, flexible covering, packaging, etc., can solve the problems of low elongation performance and low tensile strength

Active Publication Date: 2016-07-06
JIANGSU DONGHUI BIO-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two films either have low tensile strength (TS) or low elongation (EB), and the blending time of polysaccharide and Curdlan takes several hours

Method used

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  • Polysaccharide-base gel composite film, and preparation method and application thereof
  • Polysaccharide-base gel composite film, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Preparation process of polysaccharide gel composite film

[0035] (1) Sodium alginate, carrageenan or sodium alginate, carrageenan are mixed in a ratio of 1:1, respectively weigh 3g and dissolve in 97g of water under the action of a magnetic stirrer to obtain 3% Three kinds of polysaccharide solutions; Weigh 2g of Curdlan powder and dissolve it in 90g of pure water. After Curdlan is fully swollen, slowly add 1g of NaOH or 1.4g of KOH under the action of a magnetic stirrer, and make up to 100g with pure water. The mass percent content is 2% Curdlan solution; weigh 5g of CMC-Na, and dissolve it in 95 grams of pure water under the action of a magnetic stirrer to prepare a 5% mass percent CMC-Na solution.

[0036] (2) Take 44.5g polysaccharide solution, 40g Curdlan solution, and 15g CMC-Na solution and mix slowly, slowly add 2.5mol / L citric acid dropwise to adjust the pH value of the mixture, and add 0.5g glycerin. During the dropwise addition of the acid soluti...

Embodiment 2

[0040] Embodiment 2: Method for measuring the properties of polysaccharide gel edible film

[0041] (1) Mechanical properties

[0042] The film was cut into strips of 8cm*2cm, and fixed on a physical property analyzer for measurement. Set the initial distance between the two fixtures of the physical property meter to 80mm, and the speed to 0.8mm / sec. After the measurement, record the force (g) at the instant the film breaks and the distance L between the two clamps when the film breaks. For each sample, five parallel samples were taken for determination.

[0043] Tensile strength TS (g) is calculated according to the following formula:

[0044] TS=Fm / d*W

[0045] Where: TS—tensile strength, (MPa);

[0046] Fm—the maximum tension that the sample bears when it breaks, (N);

[0047] d—film thickness, (m);

[0048] W—film width, (m).

[0049] The elongation at break E (%) is calculated according to the following formula:

[0050] E=(L 1 - L 0 ) / L 0

[0051] In the formu...

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Abstract

The invention discloses a polysaccharide-base gel composite film, and a preparation method and application thereof. The preparation method comprises the following steps: adding a Curdlan solution, a sodium carboxymethyl cellulose solution and glycerol into any one or two of an edible polysaccharide-sodium alginate solution and a carrageenin solution, and regulating the pH value of the mixed solution to 4-8 to obtain a film forming solution; carrying out ultrasonic degassing, and pouring into a teflon plate; setting, carrying out sterilization treatment, cooling at 4 DEG C for 10-20 minutes, and carrying out drying and film peeling under certain conditions; and after the film is peeled, immersing the film in any one or two of a KCl solution and a NaOH solution for 5-20 minutes, and naturally airing. Common polysaccharide substances in food are used as the matrix, the glycerol is used as the plasticizer, and the Curdlan and sodium carboxymethyl cellulose are added to prepare the composite film. The composite film has the advantages of favorable mechanical properties, favorable water tightness and favorable heat stability, and is green, environment-friendly and edible.

Description

technical field [0001] The invention belongs to the field of food industry biotechnology, and relates to a polysaccharide-based gel composite membrane, a preparation method and application thereof. Background technique [0002] Chemically synthesized packaging materials are not only difficult to degrade, but also harmful components will inevitably transfer to the food during storage, thereby affecting the quality of the substance. Edible packaging materials are based on natural edible substances, such as polysaccharides, proteins, cellulose and their derivatives, through the interaction of different molecules to form a fresh-keeping food, non-toxic, edible packaging with a porous network structure. Packaging Materials. At present, edible films are not widely used and cannot replace the use of plastics, mainly because the prepared edible films cannot be compared with chemical polymer plastics in terms of mechanical properties, water resistance, stability, transparency, and p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/04C08L5/00C08L1/28C08K5/053C08J5/18C08J3/24C08J9/28B65D65/46
CPCB65D65/463C08J3/246C08J5/18C08J9/28C08J2305/00C08J2305/04C08L5/00C08L5/04C08L2201/08C08L2203/16C08L2205/02C08L2205/025C08L2205/03C08L2205/035C08L2205/04C08L1/286C08K5/053
Inventor 张充步国建张晓健解秀娟
Owner JIANGSU DONGHUI BIO-TECH CO LTD
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